Change campfire timezones in UtBS S3

Instead of having another ToD, the image of the current ToD is used,
but illuminated. This is a visual change, no gameplay changes included.

The ToD shifting for 'dawn' looked better than for 'dusk', and was
conidered better looking than having no ToD shift compared to the
surrounding.

part of #3056

[ci skip]

(cherry-picked from commit c7d8d23256)

data/campaigns/Under_the_Burning_Suns/scenarios/03_Stirring_in_the_Night.cfg

@@ -15,6 +15,10 @@
     {UTBS_MAP 03_A_Stirring_in_the_Night.map}
     snapshot="no"
     {LONGDARK4}
+    [+time]
+        # po: Use the same translation as for the string in the wesnoth-help textdomain.
+        name= _ "The Long Dark"
+    [/time]
     # Set initial turns to 12 to give impression that that is how long player needs to
     # survive.
     turns=12
@@ -304,13 +308,18 @@
         {VARIABLE zur_defeated 0}
         {VARIABLE defiant_death 0}
 
-        #Time Areas correspond with halos around campfires
+        # Time Areas correspond with halos around campfires
         [time_area]
             x=14,16,13
             y=10,15,20
             id=campfires
             radius=2
-            {DUSK}
+            {DAWN}
+            [+time]
+                # po: Use the same translation as for the string in the wesnoth-help textdomain.
+                name= _ "The Long Dark"
+                image=misc/time-schedules/after-the-fall/15longdark4.png~BLIT(misc/tod-bright.png)
+            [/time]
         [/time_area]
     [/event]
 

data/core/macros/schedules.cfg

@@ -644,8 +644,6 @@
     [/time]
 #enddef
 
-#use same image as second watch
-
 #define LONGDARK3
     [time]
         id=long_dark3
@@ -658,6 +656,8 @@
     [/time]
 #enddef
 
+# When changing this image's name, change it as well in UtBS S3.
+
 #define LONGDARK4
     [time]
         id=long_dark4